Floquet's Unit Cell Design for Periodic Structures at Optical Frequencies

Figure 6

Single unit cell Floquet’s resonance condition (passband condition) for different ratio transformation 𝑟. The passband condition is below the dashed line: in this case, 𝑛₂=3.408, 𝐿₁=1 𝜇m, 𝜆₀=1.55 𝜇m, and 𝐿₂ can be fixed in order to select the resonance condition.